From 6c358a842baaf6d211a5c8c1717d815e7813ed96 Mon Sep 17 00:00:00 2001
From: JSDurand <mmemmew@gmail.com>
Date: Sun, 11 Jul 2021 18:45:38 +0800
Subject: First commit

Now I have a kind of piano like instrument.  A violin-like instrument
is being constructed.
---
 util.h | 126 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 util.h

(limited to 'util.h')

diff --git a/util.h b/util.h
new file mode 100644
index 0000000..700a8bf
--- /dev/null
+++ b/util.h
@@ -0,0 +1,126 @@
+#ifndef UTIL_H
+#define UTIL_H
+
+/* Mostly types, constants, and macros */
+
+/* A simple singly linked list */
+
+/* Push a node to the singly linked list. */
+#define PUSH_NODE(NUM_VAR, POINTER, CUR, VALUE, TYPE) {                 \
+    (NUM_VAR)++;                                                        \
+    if (NUM_VAR > 1) {                                                  \
+      (POINTER) = MYALLOC(Node_t, 1);                                   \
+      *(POINTER) = (CUR);                                               \
+      (CUR) = (Node_t) { (Node_v) { .TYPE=(VALUE) }, (POINTER) };       \
+    } else {                                                            \
+      (CUR) = (Node_t) { (Node_v) { .TYPE=(VALUE) }, NULL };            \
+    }                                                                   \
+  }
+
+/* Pop one node out of the singly linked list. */
+#define POP_NODE(NUM_VAR, X, CUR, NEXT, TYPE) { \
+    (NUM_VAR)--;                                \
+    X = CUR.value.TYPE;                         \
+    if (CUR.next) {                             \
+      NEXT = *(CUR.next);                       \
+      free(CUR.next);                           \
+      CUR = NEXT;                               \
+    }                                           \
+  }
+
+/* An empty node. */
+#define EMPTY_NODE (Node_t) { (Node_v) { .f=0 }, NULL }
+
+typedef union {
+  float f;
+  void *v;                      /* very evil */
+} Node_v;
+
+typedef struct Node {
+  Node_v value;
+  struct Node *next;
+} Node_t;
+
+/* macros */
+
+#define MYALLOC(X, Y) ((X *) malloc(sizeof(X)*Y)) /* The most useful macro perhaps */
+
+/* Constant macros */
+
+#define SAMPLE_RATE 44100.0f
+#define DEFAULT_OUTPUT_NAME "output.mp3"
+#define STDP 440.0f
+/* I don't want to use a global variable for this constant. */
+#define STD_BASE 1.059463094359295f
+/* TODO: Set Volume, and other settings in the sheet. */
+/* These can now be changed in the sheet. */
+#define BPM 120.0f
+#define BEAT_DUR (60.0f / BPM)
+
+/* Frequency modulation */
+
+#define FM_FREQUENCY 2.0f
+#define FM_AMP 0.02f
+
+/* For ADSR */
+#define ATTACK_P 0.01f
+#define DECAY_P 0.495f
+#define RELEASE_P 0.49f
+#define SUSTAIN_P (1.0f-(ATTACK_P+DECAY_P+RELEASE_P))
+#define SUSTAIN_LEVEL 0.7f
+
+/* attribute macros */
+
+#define AHC_ATTR __attribute__((__always_inline__, __hot__, __const__))
+#define AH_ATTR __attribute__((__always_inline__, __hot__))
+#define HC_ATTR __attribute__((__hot__, __const__))
+#define H_ATTR __attribute__((__hot__))
+#define UNUSED __attribute__((__unused__))
+#define U_ATTR UNUSED
+
+#define D_ATTR(X) __attribute__((__unused__, __deprecated__("This is deprecated.\n" \
+                                                            "Please use " X \
+                                                            " instead")))
+
+#define UC_ATTR __attribute__((__unused__, __const__))
+#define UH_ATTR __attribute__((__unused__, __hot__))
+#define UHA_ATTR __attribute__((__unused__, __hot__, __always_inline__))
+
+/* types */
+
+typedef float Volume;
+typedef float Samples;
+typedef float Hertz;
+typedef float Seconds;
+typedef float Pulse;
+typedef float Beats;
+typedef float Semitones;
+typedef Pulse *Wave;
+
+typedef unsigned long LENT;
+
+typedef struct {
+  Wave w;
+  LENT n;
+} WaveFrag;
+
+/* supported instrument types */
+
+typedef enum {
+  PIANO,
+  DRUMKICK
+} InstrumentTypes;
+
+/* some helper functions */
+
+U_ATTR LENT max(LENT a, LENT b);
+
+U_ATTR LENT min(LENT a, LENT b);
+
+UNUSED long read_entire_file(const char *file_name, char **str);
+
+U_ATTR WaveFrag mix_waves(WaveFrag *frags, LENT len);
+
+HC_ATTR Hertz stoh(const Semitones st);
+
+#endif
-- 
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